Disk array controller
In computing, a disk array controller is a computer hardware device which provides secondary storage services to computer systems, often in large servers. It is the critical component of a disk array.
A disk array controller usually attaches to a number of disk drives in disk enclosures which are organised into RAID sets or groups for data protection and performance reasons.
Disk array controllers often provide other services in addition to RAID arrays. These include a read cache, a fast write cache, and copy services such as Flash Copy and Peer to Peer Remote Copy (ESCON or FICON for connecting to a mainframe computer
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